Incinerator



United States Patent C) M 3,200,777 HNCINERATGR Owen F. Mclintire, 145 W. Ogden Sh, Capron, Ill. Filed on. i, 1962, Ser. No. 227,134 3 Claims. (Cl. 110-18) This invention relates to refuse incinerators and, more particularly, to incinerators of the type mountable alongside a building wall to receive refuse through an access opening in the wall and a feed passage formed by a tubular throat fast in the wall and leading from the access opening to the feed opening of the incinerator.

The primary object of the present invention is to form the feed passage of an incinerator of the above character in a novel manner which avoids damage to the building Wall due to the repeated expansion and contraction of the incinerator and the throat during heating and cooling of the incinerator.

A more specific object is to provide an air gap between the throat and the incinerator thereby to eliminate heat conduction between the two and to prevent the transmission of movement of the incinerator Wall to the throat and the building wall.

Another object is to utilize this air gap as the inlet for combustion air into the incinerator whereby the throat is continuously cooled during operation of the incinerator.

A further object is to provide a novel bathe for preventing the emission of sparks through the gap.

Other objects and advantages of the invention will become apparent from the following detailed description taken in connection with the accompanying drawing, in which FIGURE 1 is a fragmentary perspective view of an incinerator and throat embodying the novel features of the present invention.

FIG. 2 is a fragmentary sectional View taken along the line 2-2 of FIG. 1 showing the mounted relationship of the incinerator with a building wall.

FIG. 3 is a fragmentary sectional view taken along the line 3 3 of FIG. 2.

As shown in the drawings for purposes of illustration, the invention is embodied in an incinerator 1d mounted on one side of a building wall 11 (FIG. 2), usually an outside wall of masonry or concrete construction, to receive combustible refuse from the inside of the building through an access opening 12 in the wall. When refuse is burned in an incinerator of this type, it is loaded from the inside of the building. At the same time, fire hazards and smoke and disorder inside the building are eliminated.

In this instance, the incinerator comprises an upright cylindrical body formed by a metal plate shell 13 lined with refractory material 14 such as fire brick capable of withstanding the extreme temperatures generated in the combustion chamber 15. The lower end of the body rests on a foundation 1? and the top is covered by a refractory-lined dome it? formed with a central outlet opening 19 through which the lower end of a stack 2% projects. The latter is held in an upright position by angularly spaced braces 21 fastened at their upper ends to lugs 22 intermediate the ends or" the stack and at their lower ends to similar lugs 23 spaced around the top of the incinerator body. Suspended below the lower end of the stack is a baflie 24 for retarding the passage of sparks from the chamber into the stack.

To receive the refuse, the incinerator id is formed with a feed opening 25 facing toward the building wall 11 and preferably level with the access opening 12 therein. A substantially closed feed passage 27 defined by .a tubular throat 28 preferably composed of steel plate and fast in 32b0,??? Patented Aug. 17, 1965 the building wall connects the two openings to guide refuse from the building into the incinerator.

While this throat may take various forms, herein it is of rectangular cross-section and extends from a point just inside the wall 11 to the feed opening in the incinerator. The throat is permanently secured in the wall by angle bars 33 (FIG. 2) welded to the sides of the throat and abutting against both the inside and outside of the wall around the opening.

The passage 27 normally is closed at its inner end by a so-called b-i-parting door 31 formed by two vertically sl-idable rectangular plates 32 and 33 supported in a common vertical plane by a rectangular frame including two upright side bars 34 of right angle cross-section spaced apart to lie adjacent the ends of the plates and connected across their lower ends by a crossbar 35. The side bars 3 2- are secured as by welding to the inner end of the throat 28 (see FIG. 3) and cooperate with elongated upright flanges 37 to define tracks in which the edges of the plates slide. Lugs $8 project laterally from the lower plate 33 and through elongated slots 39 in the side bars.

:Past on and depending from the lower plate 33 through the crossbar 35 is a rod 40 carrying a foot pedal 41 which, when pressed downwardly, slides the lower plate downwardly along the track. Cables 42 fast at one end on the projecting ends of the lugs 38 and extending upwardly around pulleys 43 journaled on the upper ends of the side bars are connected to the upper plate 32 to raise this plate as the lower plate moves downwardly. To limit raising and lowering of the plates, the lugs abut against the opposite ends of the slots 39. Preferably, the upper plate is some what heavier than the lower so that the door closes automatically when the foot pedal is released.

In commercial applications where large quantities of refuse such as papenboard shipping boxes and other packing materials are burned periodically, extremely high temperatures are generated in the combustion chamber 15 with the result that the temperature of the incinerator wall 13, 14 and the throat 28 varies over a wide range. In prior incinerators of this type, the expansion and contraction of the incinerator and the throat due to this heating often have resulted in serious cracking and even breaking out of the building wall 11, the throat being heated both by conduction from the contiguous portions of the incinerator and by direct radiation from the fire therein, and being shifted endwise back and forth by the movement of the incinerator wall.

To avoid such damage, the present invention contemplates forming the feed passage 27 in a novel manner to prevent the application of the forces of expansion and contraction of the incinerator on the building wall 11 and also to cool the throat 23 continuously during operation thereby to reduce expansion and contraction of the throat itself. To these ends, an air gap 44 is formed completely around the throat between the latter and the adjacent portion of the incinerator. With this arrangement, there is no conduction of heat from the incinerator to the throat, and combustion air flowing into the incinerator through the gap cools the throat. Most importantly, the throat is free to float back and forth relative to the incinerator as the latter expands and contracts. Thus, there is very little heating of the throat, and none of the movement of the incinerator Wall is transmitted to the throat.

In this instance, the throat 28 is of substantially smaller cross-sectional area than the feed opening 25 and telescopes at its outer end into the opening. The latter is formed by another tubular throat 45 which herein projects outwardly beyond the incinerator shell 13 a short distance and projects inwardly through the firebrick 14 as shown in FIG. 3. This throat also is of steel plate construction and is securely supported in the incinerator wall. The two telescoping throats overlap slightly to form the substantially closed feed passage 27. The throat 45 also is of rectangular cross-section large enough to receive the throat 28 with sufficient clearance on all sides to form the air gap Milne-tween the throats. For example, the gap maybe on the order of one-fourth to threetourths inchon each side.

With the foregoing arrangement, boxes and the like are fed into the incinerator simply by opening the door fi l and pushing them along the passage 27 and into the combustion chamber 15. With the door closed and the refuse burning, combustion air enters the combustion chamber through the air gap 4-4 as indicated by the arrows in FIGS. 2 and 3. As the rate of combustion and the heat intensity increase, the air flow through the gap also increases to maintain the temperature of the throat 28 at a relatively low level thereby minimizing heating and expansion of the throat. Moreover, because the two throats are free to float relative to each other, expansion and contraction of the incinerator wall have no effect on the throat 28 or the building wall 11. Once a flow of air is established through the gap, this flow reduces blow-back of smoke through the wall 11 even when the door 31 is opened.

Preferably, a baffie 47 is secured to the inner throat 23 to project outwardly across the air gap 44 thereby to prevent the emission of sparks through the gap. Herein,

this bafile is formed by angle bars welded to the inner throat with one side of each bar projecting past the adjacent side of the outer throat and the other side extending toward the incinerator. Thus, the angle bars and the outer throat cooperate to define indirect air passages in which sparks are trapped.

It will be seen that the incinerator described herein embodies all of the advantages of outside incinerators while at the same time avoiding the disadvantages thereof, this being accomplished by forming the feed passage with the air gap 44 on all sides for preventing heating of the throat 28 by conduction. At the same time, the continuous flow of combustion air through the gap cools all sides of the throat 28 to prevent high heating thereof by radiation. In this manner, heating and cracking of the building wall .11 in service use are eliminated.

I claim as my invention:

1. In combination with a building wall having an access opening therethroug-h, an incinerator mounted adjacent one side of said wall and having a feed opening adjacent said wall, a first tubular throat mounted on said incinerator in communication with said feed opening and projecting toward said access opening, and a second tubular throat mounted on said wall in communication with said access opening and projecting toward and telescoping into said first throat thereby to define a feed passage between said wall and said incinerator, the exterior of said second throat being substantially smaller than the interior or" said first throat, and said'second throat being supported solely on said wall in spaced and freely movable relation with all of the walls of said first throat thereby forming a continuous air gap on all sides of said second throat and preventing heat conduction from said incinerator to the second throat.

2. In combination with a building wall having an access opening therethrough, an incinerator mounted adjacent one side of said wall and having a feed opening adjacent said wall, a tubular throat mounted on said wall in communication with said access opening and projecting toward said feed opening to form a feed passage from said wall to said incinerator, the walls of said throat being spaced from and freely movable relative to the walls of said feed opening and said incinerator to form a substantially continuous air passage around all sides of said throat into said incinerator whereby combustion air is drawin into'said incinerator around all sides of said throat, and a door mounted on the side of said Wall remote from said incinerator and normally closing said access opening.

3. In combination with a building wall having an access opening therethrough, an incinerator mounted adjacent one side of said wall and having a feed opening adjacent said Wall, and a tubular throat mounted on said wall in communication with said access opening and projecting toward said feed opening to form a feed passage from said wall to said incinerator, the walls of said throat being spaced from and freely movable relative to the walls of said feed opening and said incinerator to form a substantially continuous air passage around all sides of said throat into said incinerator whereby combustion air is drawn into said incinerator around all sides of said throat.

References Cited by the Examiner UNITED STATES PATENTS 1,074,195 9/13 Pascoe. 2,745,397 5/56 Levin 126-77 2,880,682 4/59 Peterson et a1. 1l0-18 FREDERICK L. MATTESON, 511., Primary Examiner.

JAMES W. WESTHAVER, Examiner. 

3. IN COMBINATION WITH A BUILDING WALL HAVING AN ACCESS OPENING THERETHROUGH, AN INCINERATOR MOUNTED ADJACENT ONE SIDE OF SAID WALL AND HAVING A FEED OPENING ADJACENT SAID WALL, AND A TUBULAR THROAT MOUNTED ON SAID WALL IN COMMUNICATION WITH SAID ACCESS OPENING AND PROJECTING TOWARD SAID FEED OPENING TO FORM A FEED PASSAGE FROM SAID WALL TO SAID INCINERATOR, THE WALLS OF SAID THROAT BEING SPACED FROM THE FREELY MOVABLE RELATIVE TO THE WALLS OF SAID FEED OPENING AND SAID INCINERATOR TO FORM A SUBSTANTIALLY CONTINUOUS AIR PASSAGE AROUND ALL SIDES OF SAID THROAT INTO SAID INCINERATOR WHEREBY COMBUSTION AIR IS DRAWN INTO SAID INCINUERATOR AROUND ALL SIDES OF SID THROAT. 